Try using latest publushed webview iframe version for external webviews

src/vs/workbench/contrib/webview/browser/webviewElement.ts

@@ -10,6 +10,7 @@ import { URI } from 'vs/base/common/uri';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { ExtensionIdentifier } from 'vs/platform/extensions/common/extensions';
 import { IFileService } from 'vs/platform/files/common/files';
+import product from 'vs/platform/product/browser/product';
 import { ITunnelService } from 'vs/platform/remote/common/tunnel';
 import { ITheme, IThemeService } from 'vs/platform/theme/common/themeService';
 import { Webview, WebviewContentOptions, WebviewOptions } from 'vs/workbench/contrib/webview/browser/webview';
@@ -145,8 +146,7 @@ export class IFrameWebview extends Disposable implements Webview {
 	}
 
 	private get endpoint(): string {
-		const useExternalEndpoint = this._configurationService.getValue<string>('webview.experimental.useExternalEndpoint');
-		const baseEndpoint = useExternalEndpoint ? 'https://{{uuid}}.vscode-webview-test.com/8fa811108f0f0524c473020ef57b6620f6c201e1' : this.environmentService.options!.webviewEndpoint!;
+		const baseEndpoint = this.externalEndpoint || this.environmentService.options!.webviewEndpoint!;
 		const endpoint = baseEndpoint.replace('{{uuid}}', this.id);
 		if (endpoint[endpoint.length - 1] === '/') {
 			return endpoint.slice(0, endpoint.length - 1);
@@ -154,6 +154,15 @@ export class IFrameWebview extends Disposable implements Webview {
 		return endpoint;
 	}
 
+	private get externalEndpoint(): string | undefined {
+		const useExternalEndpoint = this._configurationService.getValue<boolean>('webview.experimental.useExternalEndpoint');
+		if (!useExternalEndpoint) {
+			return undefined;
+		}
+		const commit = product.quality && product.commit ? product.commit : '211fa02efe8c041fd7baa8ec3dce199d5185aa44';
+		return `https://{{uuid}}.vscode-webview-test.com/${commit}`;
+	}
+
 	public mountTo(parent: HTMLElement) {
 		if (this.element) {
 			parent.appendChild(this.element);